>> reporter: now the stakes quickly became much higher for this investigation. kay parsons had been murdered. and edmunds started thinking this killer might just be someone who knew both women, becky and kay. someone who had been right there at the scene of the crime. coming up -- police take a closer look at becky's son michael. >> he discovers his mother's house broken into. he's on the scene when we get there. so that raised a lotta red flags. >> reporter: but why would michael murder his mother's best friend? mother's best friend here's your buick sir.